Forerunner of the Coalition is a uncommon Creature — Human Pirate card from Rivals of Ixalan (RIX), collector number 72. Current market price: $0.56 (foil $3.67), TCGplayer market prices via Scryfall.
When this creature enters, you may search your library for a Pirate card, reveal it, then shuffle and put that card on top. Whenever another Pirate you control enters, each opponent loses 1 life.